(g) comply (or cause compliance) with all applicable laws and the
 regulations of the Air Authority and other aviation
 authorities with jurisdiction over Lessee or the Aircraft, any
 Engine or Part regardless of upon whom such requirements are
 imposed and which relate to the maintenance, condition, use or
 operation of the Aircraft or require any modification or
 alteration to the Aircraft, any Engine or Part; and

 (h) maintain in good standing a current certificate of
 airworthiness (in the appropriate category for the nature of
 the operations of the Aircraft) for the Aircraft issued by the
 Air Authority except where (i) the Aircraft is undergoing
 maintenance, modification or repair required or permitted by
 this Agreement; or (ii) the Air Authority shall have withdrawn
 or suspended such certificate in respect of all aircraft of
 the same model or period of manufacture as the Aircraft (in
 which case Lessee shall comply with all directions of the Air
 Authority in connection with such withdrawal or suspension).
 Lessee will from time to time provide to Lessor a copy of the
 certificate of airworthiness promptly after receipt of a
 written request.

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 8.13 PERMANENT REPLACEMENT OF ENGINES AND PARTS:

 (a) Subject to Clauses 8.14 and 8.16, Lessee shall promptly
 procure the replacement of any Engine (an "Original Engine")
 which has suffered an Engine Event of Loss, and Lessee may
 procure the replacement of any Engine (an "Original Engine")
 in order to comply with the requirements of the Return
 Conditions, in each case with an engine complying with the
 following conditions: